ABSTRACT
En un control fitosanitario efectuado en las provincias de San Antonio y Valparaíso, algunos árboles de plantaciones de Eucalyptus sp., presentaron un daño cortico vascular, síntomas de amarillez foliar y presencia de galerías subcorticales con compromiso medular, abundantes larvas de un coleóptero xilófago y presencia de micelio. Las muestras del tronco mantenidas en cámara de crianza por 45 días, permitieron la emergencia del estado adulto del insecto, determinándose como Ectinogonia buquetti Spinola (Coleoptera, Buprestidae). En los cultivos en cámara húmeda de la corteza afectada y del escarabajo en agar avena, se desarrolló además un hongo con abundantes peritecios negros de largos cuellos. Morfológicamente se clasificó como Ophiostoma stenoceras (Robak) Melin & Nannf., con anamorfo en Sporothrix (Ascomycota, Ophiostomatales, Ophiostomataceae), determinación ratificada por M.J. Wingfield en Sud Africa. Su fase conidial es casi indistinguible del patógeno humano Sporothrix schenckii. Actualmente se considera como un saprófito o un topatógenodébil, sin registros aparentes en Chile. Se aportan datos taxonómicos y filogenéticos actuales del complex O. stenoceras, de sus integrantes en el suelo, madera de coníferas y su asociación a coleópteros vectores.
During a phytosanitary control carried out in San Antonio and Valparaíso provinces, some trees belongingto Eucalyptus sp. plantations exhibited vascular cortical lesions, yellowish leaves signs and the existence ofsubcortical galleries involving some medular compromise together with a high number of xylophagous coleopteran larvae and presence of mycelia. Samples of the trunk which were kept in breeding chambers for 45 days allowed the emergence of the insect in its adult stage which was identified as Ectinogonia buquetti Spinola (Coleoptera, Buprestidae). In cultures of the affected bark kept in a humid chamber as well as the beetle put in oatagar, a fungus having abundant black long-necked perithecia was developed. It was morphologically classified as Ophiostoma stenoceras (Robak) Melin &Nannf, with its anamorph in Sporothrix (Ascomycota, Ophiostomatales, Ophiostomatacea), a classificationwhich was confirmed by M.J.Winfield in South Africa. Its conidial stage is almost undistinguished from the human pathogen Sporothrix schenckii. It is considered at present as a saprophyte or a weak phytopathogenous which lacksapparent records in Chile.Updated taxonomic and phylogenetic data of the O.stenoceras complex, about its components in the soil, conipherous wood as well as its association with coleopteran vector are supplied.